[GreenKeys] I need help (CV-57, CV-89A)

[WA5CAB@cs.com]

Clarence,

Both units are receiving converters, converting received frequency shift 
keyed signals into keyed DC for a TTY loop.  Both use external DC loops 
supplies and both will work at both 20 and 60 MA.  Both were primarily used 
by USN.

The CV-57/URR is an IF type, with an input frequency of 455 KHz plus/minus a 
few.  It will work standalone or drive one of two inputs of a CM-14/URR 
Comparator for diversity operation.  It is part of AN/URA-6 (the CM-14 is 
part of AN/URA-6, 7 & 8).

The CV-89A/URA-8B (not 89) is essentially the same thing except that its 
input is audio (so it will also handle AFSK) and it can drive a loop or one 
input of a CM-22/URA-8A.  It is an FM type and will copy shifts from about 
170 Hz (but not too well - its intended shift was 850 Hz) up to about 1 KHz 
(this from memory/experience - manuals are in the attic).  It is part of 
AN/URA-8B.

Note that the AN/URA-8 mentioned above shares no components with the 
AN/URA-8A and -8B.  Except for a few cables, tubes and maybe some knobs.  -8A 
should have been called something else.

I> 
> I have one units CV-57/URR and one-CV-89A/URA-89. On the front is a tag-
> 
> FREQUENCY SHIFT CONVERTER.Does any one know what I have???
> I recieved the units with a model 28 teletype machine.Tnx in advance for
> any help.73 for now.


73
Robert Downs
Houston
<WA5CAB@cs.com>


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